Artifigiai



S. MYERSON.

ARTIFICIAL `TOOTH. APPLICATION F1LED1ULY27. 1916.

1 ,205,922. Patenten Nov.r 21, 1916.

nvenoz,

@513W v uw# simon MYEnsoN', or''(mistlampen, MASSACHUSETTS.

Togliwhom it may concerti;- L.

Be. it known thaty I, SIMoN Mynnsox, a-

' citizen of the United States,- residing at Cambridge, inthe conntyof Middlesex 'and .State of Massachusetts, have invented new* and Auseful ImprovementsA in Artificial tlon.

vThisinventionrelates' to an artificial tooth composed of a replaceable'body -ot porcelain having a socket', vand .a metallic backingcovering one of the surfaces of the body, and having a tenon filling the socket. said socket and vtenon Sbeing interengaged in such manner asto form a. separable connection between the body and backingl and resist displacement -otf the body by forces ot' mastication.

The object. ofthe invention is to so improve the form of the vsocket and tenon'as to' enable the backing and tenon Lto',strongly support the porcelain.body Without unduly weakening vltal parts of the body by there,- dnction of its crosss'ectinal area -in forni'- ing the socket, and Without requiring an objectionable increase in the bulk yof the body to compensate for said reduction.`

To this land other related ends the invention consists in; the improvements which l" will now proceed to describe'and cla-im.

Of the accompan ing-y drawingsforming a part of this vspeci cation. Figure'l represents a perspective `view ofY a front tooth body embodying the invention ;`Fig.' 2 repre sents. a perspective view of the backing for the bodysh'own by Fig. 1; Fig. 3 represent-'s a longitudinal section showing the body and backing assembled; Fig. 4. represents a sec tionon line of. Fig. 3; Fig. `5 represents a section on line 5- -5 of Fig. 3 Fig. 6 represents a longitudinals'ection illustrating another embodiment of the invention; Fig. 7

represents aperspective view of the backing and tenon shown by Fig. 6; Fig. 8 represents a longitudinal 'section illustrating a modifica-tion ofthe embodiment shown by Figs. 6 and 7;- Figi` 9 represents a perspective View of the backing and tenon shown by Fig. 8; Fi .10"re resents an end view looking towar ther-i ge lap, and illustrat ing anotherembodiment of the invention; Fig. 11 represents a section on line 11-11 of Fig. 10; Fig. 12 represents a perspective view of thev backing'and tenon shownby Figs. 10 and 11;'Fig. Iii-represents a view similar to Fig. 11, showing the socket and Specification ofLetters Patent.

apiicaannld Julie?, 19.16. seala-0. 111,652.

Teeth.' ofi which the following is a specifica- Patented Nvei; 191e.

tenon reduced at' theii' inner en portions, asili Figs. Gand 7; Fig. 1i representsa per-v spective view of illustrating a flanged tenon; Fig. 15 represents an end view looking toward the ridge lap and showing the backing and hanged tenon illustrated b v Fig. 1i: Figs. 1GA and 17 represent views similaito Fig. 15, and illustrating dill'erent flange formations on the tenon; Figs. 18. 19 and 2O illustrate modifications hereinafter described.

The saine reference characters indicate the sanne or similar parts in all the views.

Inthel drawings. 1'.)l represents a porcelain tootlibody lia-ving a fiat lingual face 12 and an inclined ridge lap IQthe lattercon- `stitutlng the end of the tooth opposite that on which the. incisa] edge. 12" is formed.

Inv the' following description I call the portion of the body having the incisa] edge the acting portion, which in this torni of tooth is relatively thin. I call't-he portion having the ridge lap 19) the base portion, thel salue being relatively thick.

The body 12 is provided' with a, socket 13I 'extending from tie base portion'into the acting portion, said socket having an end mouth opening on the ridge lap :and a mouth opening on the lin u'al face, the socket and mouth being pretgerably keyhole shaped in cross section. The lateralmouth. extends from the'ridge lap vtoward the in.-

the backinga-nd tenon,

cisal-ed'ge, and has a closedendfrelatively near the ridge lap, said lateral mouth bein wholly within the thickest base'portion oil the body so thatA it does not extend into the portion ot the lingual face at the thinner portion of the body. The socket 13 is refe era'bly extended from the closed end o the lateral month 14 into the thinner portion of the body, as shown. i

1G represents a backin formedto cover the lingual face 12a of t e body and provided with a. tenon 17 formed to closely tit the socket in the body. Said tenon includes a neck portion 18 formed to occupy the lateral mouth 14 of the socket, as shown by Figs. 1 and 2. The outer end of the tenon portion 17 is inclined and may or may vnot be lusli with the inclined ridge lap 12h of the body. The tenon and neck are preferably shaped as indicated by Figs. 2 and 4, to have an interlocking engagement with the socket and the lateral mouth.

It will now be seen that when the body and backing are assembled reciprocal bear- Vso 12b of `thebod 'the' reduction or. grinding the end of thetenon..

Figs. 6, '7, S' 'and9 shortr vthetenon. :indl

of ma sticzitionfitliese the ablitts n formed by the closed-inner end of the socket und the closed end ofthe finou-thjlfi; and

18, said shoulders bearing on Vsaid abut;

ments; j-Itlwill also be see'nthat thepo'rl tions of the socket and tenon whichdnlude the laterelgxnouth 14.- :md-the neck 18'` are Wit-hin the. relatively @thick has@ portion. of

the' body 'Where there is. suiiicient. materiel' to socket und, lateriil mouth therein sind nt the' saine time; givoid thefnecessityi off-unduly increasing the bulkoftthe buse :portion to by the forma-tion of tllesocket andlnleral mouth. It will 4beim-ther seen ,that the portions of the socketv and tenon belour the closed end of the lateralmouth 14 are within the l'relatively thin acting portiongQf: the

body having the incisa'l edge, said portions eiordinga suiiicielitly Lrm connection without eitherjwenkeing the nctingportion of the 'body or re'uiring an objectio'naiblei11-v crease o'f its bu k. l

The outer 'end'v of the telion:being4 in clined and flush with the inclined rdgelap away of.' the ,ge lap, 4Which is often necesf, sary in practice, also reduces or grinds sway socket formed to 4reduce to. a minimum. the weakenin of' theubore mentioned noting4 portiono the body 'by the .reductioniofits cross sctionelfcre occasioned by thesocket.

. In the en 'i'bodiIfIiBI'xi'V of" the invention. shown by Figs. 6 and 7, the art 13 of the.. socket, which extends' into t fe: seid'octing. portion iis reduced in diameter or cross v"section, an abutmentfoi door 14? beingiormed at thejunctionfof the reduced port'.1,3f'w'ith1 the main or'oter'part of the Socket. T he tenon has areduced inner part 17l fitting the reduced socket 'part end a; shoulder bearing on'the door o rabutinent 14% The said fioor as here 'shown coincides vwith `the closed end of the l'eterel 'mouth 14,' but may be either below or above said closed end.

in the embodiment of the inventionportion of. the :tenen: which occupies said shown by und 9, the reduction of. the inner parts of the'socket and tenonis caused by tapering the socket and tenori.l Thetapered socket'and tenon mcy?, be shouldered, as' shown, to provide the socket with a Hoor or abutment, and theV .tnon with' the mouth' '14.

end ciu-the. soczket"end-:finl geni-d of 'When the body vand backing .nre assemjbled the socket well .e'eclh of .the two-Aembo'dim'ents 'last described provides en ,effecftiie'iebiit'rne'ntor seat for the tenen, enabling t l 1e letter to'effective'ly .resist forces ciV mns- .fibntiom the strength of the acting portion 5 .iftlie bodybeingso little 4impaired that 4liability to break is reduced to the minim11m, without requiring on objectionable in= creaseinthe bulk micross sectional areaof. tl1e .a.ctingportion offthebody.

fFigs .-10, 11,"12- andi 13 showthe lingliml face of the body provided with n. portion 12l-wl1iclr is inclined-relatively' to the main l portionli; ;Tl1e socket is similarly inclined compensate `for the loss of n mterml.,'czu1sed;.4

13, for-the purpose described in connection -with FigsLY-LS and 9. y' vThe tenon muy be vprovided `:with oppositely projecting flanges 17C, as shown by Figs'. 14, 15, 16 and 17, said Hanges increasingthe width of the tenon so that'its'pro-f jection `into the body may be considerably reduced. The socket `is formed tol closely' fit the fia-nged tenen, as shown.

The flen'ges may berformed as show-nhg' Figs. 14'and 15,or'may be otherwise forme 1', Y"

as indicated by Figs. 16 and-17.- It is ob#V rions that the anged tenen-may have a .reduced innerl part, 411s-shown 'by Figl 14, the

vinner part .of the socket 'bein 'correspond ingly reduced. It is also bmous that the flanged 'tenon and the'fsocketformed to re.-v

.ceive itmay be inclined-'relatively to -tne mein portion of the lingualfece.'

, The reduced portion 13 of'thetenonmey'. i

'have its crossl section elongated;- land' eres- V-dueed portion of the socket enig correspondingly formed. l

Figs, 1,9 and 20- show e modification in which .the enlarge the lateral mouth ofthesocket andthe-'neck mouth not-bein reduced in width.

4It will be un erstood that all of the prin- 1110 cent-shaped, as indi'ated by Fi V18,the redportions `of the socket ,imdtenon ere-su stantially semi-cylindrical,

1. An ertical tooth comprising a body l5 having a lingual. face, en inci-sel edge, a ridge lap and esocketj extending from the ridge lapinto the body of the tooth and provided with an end mouth on the ridge lap, said socket having e main-portion near lap toward the incisal edge. said main prtion having a floor facing the ridge lap, and a metallic backing formed to cover the lingual 'face and having a tenon formed to enter said end mouth and closely fit the socket and its lateral mouth, the socket wall forming an abutment cooperating with the tenon to resist force of mastication.

2. An artificial tooth comprising a body having a lingual face, an incisal edge, a ridge lapl` ahd a socket extending from the ridge lap into the body of the tooth and provided with an end mouth on the ridge lap, and with a lateral mouth extending from the ridge lap toward the incisal edge, said mouth having a closed end relatively near the ridge lap, a considerable portion of said socket being entirely closed between the lateral mouth and the incisal edge, and -a metallic backingformed to cover the lingual face and having a tenon formed to enter said end mouth and closely fit the socket and its lateral mouth.

3. An artificial tooth comprising abody having a lingual face, an incisal edge, a ridge lap, and a socket extending from the ridge lap into the body, said socket being provided with an end mouth on the ridge lap, and With a mouth in the thicker portion of the body extending rearwardly to the lingual face, said mouth having a, closed end relatively near the ridge lap, said. socket having a portion extended la considerable distance below the closed end of the mouth into the acting portion of the body, and a metallic backing formed to cover the lingual face, vand having a tenon shaped to enter lsaid mouth and closely lit the socket and its lateral mouth, the tenon being provided'with oppositely projecting lateral flanges fitting recesses formed for their socket. y

4. An artificial tooth comprising a body having a ridge lap, and a socket extending therefrom into the interior of said body, said socket having a reduced inner portion, the main portion ,of the socket being in the thicker portion of the tooth, and extending to and opening on the lingual face, the

vinner end of the said main portion providing a shoulder forminga door facing said rldge lap, relatively near the same, and a metallic backing shaped to have an extended bearing on the lingual face of said body and having a tenon projecting from its inner face and complemental to said socket, said tenon having a shoulder abutting against said floor when the tenon is Within the socket.

In testimony whereof I have aiiixed my signature.

` SIMON MYERSON.

reception in the 

